Construction material



March 27, 1934. J PFOHL 1,952,219

CONSTRUCTION MATERIAL Filed March 25, 1929 Patented Mar. 27,. 1934.

NITE STATES PATENT, OF I E v 1,952,219 i CONSTRUCTION MATERIAL.

corporation of Ohio Application March 25,1929, Serial NQ. 349,541

V 6 Claims. 01. 72-124,

My invention relates to construction material, It is addressed to aconstruction material while capable of being moulded into any desiredform, cut into desired lengths and possessing the qualities of beingadapted to absorb shocks, withstand weight, is waterproof, dustless,will not crack and will knit or heal under .trafic.

It is suitable for many .construction purposes, forming a suitablewearing surface for industrial w warehouses, loading platforms, machineshops,

textile mills, garages and many other uses.

In thedrawing I have shown a perspective view of a piece of lumberembodying my invention.

' My improved construction material is formed preferably from acomposition containing bituminous and other materials such as mineralparticles, fibrous materials, etc. These materials are suitably mixedand are formed into any desired shape,-preferab1y by extrusion, usingthe method and means described in myco-pending application, Serial No.39,619 filed June 25, 1925.

In the manufacture of my construction ma;- terial I mix bituminousmaterial such as asphalt and a filler of fibrous material and mineralmaterial in the presence of heat so as .toform' a homogeneous mass whichis then passed through an emruding'machine such as that referred to inthe above mentioned application, thereby com- ;pacting the mass andforming it into thedesired shape which operation is carried out whilethe material is warm. It is then allowed to cool and is ready for use. Ihave found that a very satisfactory construction material is obtained bytaking the waste products from the manufacture of prepared roofing,either plain or mineral surfaced, and any other waste saturated feltmaterials, mixing those with additional asphalt if there is notsuflicient asphalt in them, adding if desired additional mineral orfibrous material, or 40 both, masticating these waste materials ,in thepresence of heat until reduced to a suitable plastic state when theyareextruded by being forced through a die having an orifice of thedesired shape so that the material'will completely fill the 5 orifice inits passage therethrough and will retain 'the shape of that orificeafter passing outjfrom -thesame.

My improved construction materialcan be made very hard by the additionof mineral or by using at: asphalt that is hard at normal temperatures.

' In myimproved product the body has an outer surface in the nature of ashell B extending inward for some distance that is of greater densityand is harder than, the heart (I of the product.

' 1 The depth of this shell may be regulated by the addition gives agreater density to the homogeneous batch'and I have noticed the greaterthe density of the batch the harder the resultant product, and that bysubjecting the batch to greater pressure during the'forming process theouter portion or shell like portion becomes denser and the thickness ofthe dense hard portion increases with the increase in the pressure.While I have shown and referred to the one method of.

manufacture by extruding the material, any method that would give theresultant product desired would be satisfactory.

My improved product consists preferably'of a homogeneous mixture ofbitumen, fibrous material or fibres of any suitable nature, andparticles of mineral such as granules of slate or like mineral, finesand or pulverized mineral, any combination of these minerals, formedinto a construction material substantially of the same characterthroughout except that the outer portion is of a more dense characterthan the center.

1. A preformed construction product having the same-materialsthroughout, said materials consisting of a homogeneous mixture ofbituminous,

fibrous and mineral materials, said product having the ou er portionharder than the interior. s

2. Apreformed construction product having a shell like outer portion ofgreater hardness than the interior, said shell and. said interior formedfrom a homogeneous mixture containing asphalt hard at 'normaltemperature and scrap felted materials. V 3. A preformed constructionproduct having a shell like outer portion of greater hardness than. theinterior, said shell and said interior formed from a homogeneous mixturecontaining asphalt hard at normal temperature and scrap feltedmaterials. and granular mineral materials. Y

4. Apreformed construction product, composed of a bituminous material, amineral material and a fibrous material, preformed to the desired shapeand having a portion of said product of greaterdensity and hardnessthanthe adjacent portion.

said portions being integral. 5

, mamas 5. Acbnstruction product, composed of e homogeneous mass ofbituminous, fibrous and mineral particles, preformed to the desiredshape and having a. shell like portion of greater density than theinterior portion, said shell like; portion and interior portion beinglnwml.

6. A constructon product having a shell like ing a unitary product.

mom a. mom.

